Beam-Echo Amplifiers The following history of Beam-Echo is based upon an article written by Tony Holmes formerly of "The Juke Joint". One of the features that distinguishes a British BAL-AMi jukebox from its American AMi counterpart, is the type of amplifier that's fitted. In the case of BAL-AMi, these are Beam-Echo amps. Beam-Echo began in 1953 when a chap called Henry Rahmer..